#!/bin/sh
# display user's info......
/bin/echo "Please input the username:"
read username
/bin/grep $username /etc/passwd  > /dev/null 2> /dev/null
if [ $? -eq 0 ]
   then /bin/echo "username is : $username"
else 
   /bin/echo "user $username does not exist"
   exit 1  
   # not 0 means error exit!  0 means right exit!
fi
/bin/echo

# list /etc/passwd info
userinfo=`/bin/grep ^$username:x /etc/passwd`
userid=`/bin/echo $userinfo | /bin/awk -F: '{print $3}' `
groupid=`/bin/echo $userinfo | /bin/awk -F: '{print $4}' `
homedir=`/bin/echo $userinfo | /bin/awk -F: '{print $6}' `
shell=`/bin/echo $userinfo | /bin/awk -F: '{print $7}' `

# get group name from GID
grouptmpname=`cat /etc/group | /bin/grep :x:$groupid`
groupname=`/bin/echo $grouptmpname | /bin/awk -F: '{print $1}' `
/bin/echo "user id is : $userid"
/bin/echo "default group is : $groupname"
/bin/echo "home dir is : $homedir"
/bin/echo "shell is : $shell"


/bin/echo "group members info:"

#get group members
groups=` /usr/bin/groups $username`
/bin/echo $groups
/bin/echo

#get login info
userlogin=`/usr/bin/who | /bin/grep $username`
if [ "$userlogin" != ""  ]
   then  /bin/echo "$username is online"
else
   /bin/echo "$username is offline"
fi
